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/***************************************************************************
encoder_mp3.cpp
-------------------
begin : Sat Aug 20 2005
copyright : (C) 2005 by Martin Witte
email : emw-kradio@nocabal.de
***************************************************************************/
/***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************/
#include "encoder_mp3.h"
#include <QtCore/QMutex>
#include <QtCore/QDateTime>
#include <klocale.h>
RecordingEncodingMP3::RecordingEncodingMP3(QObject *parent, SoundStreamID ssid,
const RecordingConfig &cfg, const RadioStation *rs,
const QString &filename)
: RecordingEncoding(parent, ssid, cfg, rs, filename)
#ifdef HAVE_LAME
,
m_MP3Buffer(NULL),
m_MP3BufferSize(0),
m_MP3Output(NULL),
m_ID3Tags(NULL),
m_LAMEFlags(NULL),
m_MP3LBuffer(NULL),
m_MP3RBuffer(NULL)
#endif
{
m_config.m_OutputFormat = RecordingConfig::outputMP3;
m_config.m_SoundFormat.m_Encoding = "mp3";
openOutput(filename);
}
RecordingEncodingMP3::~RecordingEncodingMP3()
{
closeOutput();
}
static QMutex lameSerialization;
void RecordingEncodingMP3::encode(const char *_buffer, size_t buffer_size, char *&export_buffer, size_t &export_buffer_size)
{
if (m_error)
return;
#ifdef HAVE_LAME
short int *buffer = (short int*)_buffer;
size_t j = 0,
j_inc = (m_config.m_SoundFormat.m_Channels == 1) ? 1 : 2,
dj = (m_config.m_SoundFormat.m_Channels == 1) ? 0 : 1,
samples = buffer_size / m_config.m_SoundFormat.frameSize();
for (size_t i = 0; i < samples; ++i, j+=j_inc) {
m_MP3LBuffer[i] = buffer[j];
m_MP3RBuffer[i] = buffer[j+dj];
}
int n = 0;
lameSerialization.lock();
n = lame_encode_buffer(m_LAMEFlags,
m_MP3LBuffer,
m_MP3RBuffer,
samples,
m_MP3Buffer,
m_MP3BufferSize);
lameSerialization.unlock();
if (n < 0) {
m_errorString += i18n("Error %1 while encoding mp3. ", QString().setNum(n));
m_error = true;
} else if (n > 0) {
m_encodedSize += n;
export_buffer = (char*)m_MP3Buffer;
export_buffer_size = n;
int r = fwrite(m_MP3Buffer, 1, n, m_MP3Output);
if (r <= 0) {
m_errorString += i18n("Error %1 writing output. ", QString().setNum(r));
m_error = true;
}
}
#endif
}
bool RecordingEncodingMP3::openOutput(const QString &output)
{
#ifdef HAVE_LAME
// m_output = NULL;
m_LAMEFlags = lame_init();
if (!m_LAMEFlags) {
m_error = true;
m_errorString += i18n("Cannot initialize lalibmp3lame. ");
} else {
lame_set_in_samplerate(m_LAMEFlags, m_config.m_SoundFormat.m_SampleRate);
lame_set_num_channels(m_LAMEFlags, 2);
//lame_set_quality(m_LAMEFlags, m_config.mp3Quality);
lame_set_mode(m_LAMEFlags, m_config.m_SoundFormat.m_Channels == 1 ? MONO : JOINT_STEREO);
// lame_seterrorf(m_LAMEFlags, ...);
// lame_setdebugf(m_LAMEFlags, ...);
// lame_setmsgf(m_LAMEFlags, ...);
lame_set_VBR(m_LAMEFlags, vbr_default);
lame_set_VBR_q(m_LAMEFlags, m_config.m_mp3Quality);
if (lame_init_params(m_LAMEFlags) < 0) {
m_error = true;
m_errorString += i18n("Cannot initialize libmp3lame parameters. ", output);
}
if (!m_error) {
id3tag_init(m_LAMEFlags);
id3tag_add_v2(m_LAMEFlags);
QString title = m_RadioStation ? m_RadioStation->name() : i18n("unknown station");
title += QString(" - %1").arg(QDateTime::currentDateTime().toString(Qt::ISODate));
QString comment = i18n("Recorded by KRadio");
size_t l = title.length() + comment.length() + 10;
m_ID3Tags = new char[l];
char *ctitle = m_ID3Tags;
strcpy(ctitle, title.toLocal8Bit());
char *ccomment = m_ID3Tags + strlen(ctitle) + 1;
strcpy(ccomment, comment.toLocal8Bit());
id3tag_set_title(m_LAMEFlags, ctitle);
id3tag_set_comment(m_LAMEFlags, ccomment);
}
m_MP3Output = fopen(output.toLocal8Bit(), "wb+");
if (!m_MP3Output) {
m_errorString += i18n("Cannot open output file %1. ", output);
m_error = true;
}
size_t nSamples = m_config.m_EncodeBufferSize / m_config.m_SoundFormat.frameSize();
m_MP3BufferSize = nSamples + nSamples / 4 + 7200;
m_MP3Buffer = new unsigned char[m_MP3BufferSize];
m_MP3LBuffer = new short int[nSamples];
m_MP3RBuffer = new short int[nSamples];
if (!m_MP3Buffer || !m_MP3LBuffer || !m_MP3RBuffer) {
m_error = true;
m_errorString += i18n("Cannot allocate buffers for mp3 encoding. ");
}
}
if (m_error) {
if (m_LAMEFlags) lame_close(m_LAMEFlags);
m_LAMEFlags = NULL;
if (m_MP3Output) fclose(m_MP3Output);
m_MP3Output = NULL;
if (m_MP3Buffer) delete [] m_MP3Buffer;
m_MP3Buffer = NULL;
m_MP3BufferSize = 0;
if (m_ID3Tags) delete [] m_ID3Tags;
m_ID3Tags = NULL;
if (m_MP3LBuffer) delete[] m_MP3LBuffer;
if (m_MP3RBuffer) delete[] m_MP3RBuffer;
m_MP3LBuffer = m_MP3RBuffer = NULL;
}
#endif
return !m_error;
}
void RecordingEncodingMP3::closeOutput()
{
#ifdef HAVE_LAME
if (m_LAMEFlags) {
if (m_config.m_OutputFormat == RecordingConfig::outputMP3) {
int n = lame_encode_flush(m_LAMEFlags,
m_MP3Buffer,
m_MP3BufferSize);
if (n < 0) {
m_error = true;
m_errorString += i18n("Error %1 while encoding mp3. ", QString().setNum(n));
} else if (n > 0) {
int r = fwrite(m_MP3Buffer, 1, n, m_MP3Output);
if (r <= 0) {
m_error = true;
m_errorString += i18n("Error %1 writing output. ", QString().setNum(r));
} else {
lame_mp3_tags_fid(m_LAMEFlags, m_MP3Output);
}
}
}
if (m_LAMEFlags) lame_close(m_LAMEFlags);
m_LAMEFlags = NULL;
if (m_MP3Output) fclose(m_MP3Output);
m_MP3Output = NULL;
m_MP3BufferSize = 0;
if (m_MP3Buffer) delete [] m_MP3Buffer;
m_MP3Buffer = NULL;
if (m_ID3Tags) delete [] m_ID3Tags;
m_ID3Tags = NULL;
if (m_MP3LBuffer) delete[] m_MP3LBuffer;
if (m_MP3RBuffer) delete[] m_MP3RBuffer;
m_MP3LBuffer = m_MP3RBuffer = NULL;
}
#endif
}
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